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Additional file 1: Figure S1 to Figure S7.
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Figure S1. Moroccan populations surveyed in this study. Each panel shows the landscape of
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the sampling site, which illustrates the overall ecological features of the populations.
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Figure S2. Population structure of A. thaliana in Morocco. A) Unrooted NJ tree constructed
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from pair-wise proportions of allelic differences among 65 haplotypes from 20 Morocco
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populations. Percent support >50% from 10,000 bootstraps is shown for each branch node.
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Branches and haplotypes are coloured according to the majority assignment to the
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STRUCTURE genetic groups presented in B. B) Genetic relationships among Moroccan
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haplotypes estimated with STRUCTURE. Each haplotype is depicted as a horizontal bar
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divided in segments representing the estimated membership proportions of genetic clusters
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(K) fitted in the model. Populations are arranged according to latitude from north to south.
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Figure S3. Isolation by distance structure of A. thaliana in the south-western Mediterranean
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region. Genetic distances are measured as proportion of allele differences between pairs of
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accessions. Correlation coefficients and slopes of linear regressions for the Iberian Peninsula
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and Morocco regions are shown above the plot.
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Figure S4. Population structure of A. thaliana in the south-western Mediterranean region.
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Figure shows the genetic relationships among 20 Moroccan and 181 Iberian individuals from
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different populations estimated with STRUCTURE. Each individual is depicted as a horizontal
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bar divided into segments representing the estimated membership proportions of genetic
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clusters (K) fitted in the model. Accessions are arranged and classified (right text line)
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according to their major membership proportions for four genetic clusters.
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Figure S5. Geographic distribution of 337 Arabidopsis thaliana populations analysed in this
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study. Left and right panels show locations of North America and Japan, respectively. Central
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panel shows locations of all other samples coloured according to the following regional
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groups: red = Morocco; yellow = Iberian Peninsula; green = British Isles; light blue = Central
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Europe; dark blue = Fennoscandia; purple = South Europe; pink = East Europe; white = West
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Asia; light grey = Caucasus; dark grey = Central Asia; black = other African samples (Cvi,
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Can, Mt).
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Figure S6. Population structure of A. thaliana at a global scale. Figure shows the genetic
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relationships among 20 Moroccan, 181 Iberian and 136 individuals from 11 other world
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regions estimated with STRUCTURE. Each individual is depicted as a horizontal bar divided
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into segments representing the estimated membership proportions of genetic clusters (K)
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fitted in the model. Accessions are arranged according to longitude from west to east within
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geographical regions except for Iberia where they are ordered according to their major
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membership coefficients for K=6. The right panel shows the number of accessions and the
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mean membership proportions of the six genetic clusters (C1 to C6) in each geographic
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region.
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Figure S7. Genetic and geographic structure of A. thaliana at global scale established by
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PCA. A) Scatter plots displaying pair combinations of the first three eigenvectors estimated by
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PCA of the worldwide collection of accessions. The six main groups detected by clustering
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analysis of the first five principal components are shown with the same colors as the
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STRUCTURE clusters of Figure 4. B) Geographic distribution of genetic group assignment of
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accessions based on PCA.
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